Past Tense of “lean”
The past tense of lean is leaned (leant in British English); the past participle is leaned (leant in British English).
Why “lean” behaves this way
"Lean" descends from Old English "hlinian," originally a weak verb. The now-less-common British form "leant" preserves an older short-vowel pronunciation pattern that also shows up in "meant" and "dreamt," where a small class of English verbs shortened their vowel in the past tense while keeping a "t" ending instead of the more typical "-ed." American English regularized "lean" fully to "leaned," while British English kept both "leaned" and the older "leant" in active use, with "leant" still common in everyday British speech and writing today.
The "-t" ending seen in "leant," rather than "-ed," reflects an older, once-widespread pattern in English weak verbs where the final consonant devoiced after a shortened vowel — the same pattern responsible for "dreamt," "burnt," "spelt," and "spoilt" in British English, all of which have fully regularized "-ed" counterparts that dominate in American English instead.
The common confusion
The confusion here is purely dialectal rather than grammatical: both "leaned" and "leant" are correct, standard forms, just associated with different regional varieties of English (American versus British), so choosing between them is a matter of matching your audience's expectations rather than avoiding an actual error.
How it's actually used
"Lean" extends figuratively into political and personal inclination — "lean toward a decision," "lean conservative," "lean on someone for support" — all of which describe a metaphorical tilt or dependence rather than a literal physical angle, and all of which take either "leaned" or "leant" depending on dialect exactly as the literal sense does. As an adjective, "lean" (meaning thin, or efficient, as in "lean meat" or "a lean operation") is a completely separate word from the same-spelled verb, coincidentally identical rather than historically related. Architecture borrowed "lean" for the specialized noun "lean-to," a simple structure whose roof leans against an existing wall, a fossil of the verb's literal physical sense preserved in a single compound noun rather than in ordinary conjugated use. In carpentry and construction, "lean" describes a structural defect when a wall or post tilts from vertical ("the fence leans badly on the north side"), a literal technical use distinct from its more common figurative senses of inclination or dependence.
Across the tense system
Both "leaned" and "leant" behave identically across every tense and construction — simple past, perfect, passive — with the only difference being which dialect's spelling convention a writer is following, unlike some British/American splits (such as "gotten" versus "got") where the underlying grammar itself differs slightly between the two varieties. The famous Leaning Tower of Pisa takes its English name directly from this verb’s progressive form, freezing "leaning" into a permanent proper-noun descriptor rather than a temporary state, unlike most ordinary uses of the word.
Common real mistakes
The main real issue isn't an error so much as an inconsistency: mixing "leaned" and "leant" within the same piece of writing looks careless, since a single document should generally commit to one dialect's convention throughout rather than switching between American and British spellings verb by verb. A genuine, separate confusion is treating adjectival "lean" (thin) as somehow related to the verb "lean" (tilt) in etymological word-history discussions, when in fact the two are unconnected words that only happen to share a spelling. Some writers also mistakenly hyphenate or split "lean-to" into two unrelated words, unaware that the compound noun has fully fused into a single fixed term for the simple structure.
Examples
- She leaned against the doorframe, waiting.
- He has leaned on his friends a lot this year. (American English)
- He has leant on his friends a lot this year. (British English)
- They leaned the ladder against the wall.
- We had leaned too far to one side, and the boat tipped.
- The tower leans slightly to the left.
- I'm leaning toward the second option.
- She leaned in to hear him better.
Memory trick
Group "lean/leant" with "dream/dreamt" and "burn/burnt" as a small British-English family that shortens the vowel and swaps "-ed" for "-t" — if you're writing for a British audience, that whole family stays available; if you're writing for an American audience, default to the fully regular "-ed" spelling across all of them.