Verb
To shift one's weight forward; to lean forward or towards something.
(figuratively) To proactively take charge of a situation; to be bold in exerting one's will in a situation.
Source: en.wiktionary.orgIf any personal description of me is thought desirable, it may be said, I am, in height, six feet, four inches, nearly; lean in flesh, weighing on an average one hundred and eighty pounds; dark complexion, with coarse black hair, and grey eyes -- no other marks or brands recollected. Abraham Lincoln
A mind, lean in its own language. In others, it gets fat. Elias Canetti
How can so much beauty hide such a bruised and steely heart, and why must I love him, why must I lean in my weariness upon his irresistible yet indomitable strength? Is he not the wizend funeral spirit of a dead man in a child's clothes? Anne Rice
elliptical, adj. The kiss I like the most is one of the slow ones. It's as much breath as touch, as much no as yes. You lean in from the side, and I have to turn a little to make it happen. David Levithan
I'll shade him from the heat till he can bear To lean in joy upon our Father's knee; And then I'll stand and stroke his silver hair, And be like him and he will then love me. William Blake
Now I've been hangin' 'round you for days, Bt when I lean in you just turn your head away. Oh no, you didn't mean that. She said I love the way you think, but I hate the way you act. Ben Harper