There's a book entitled Lean In: Women, Work, and the Will to Lead.
It's not clear what exactly phrasal verb Lean in in it's title means. Does its meaning differ from the meaning of the verb to lean in the context of the book's name?
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The book is about women needing to move out of their comfort zone and work harder to break into senior management positions traditionally held by men.
From the Free Dictionary:
"lean in (to something)"
to incline or press into something. You have to lean into the wind when you walk or you will be blown over. As you walk into the wind, lean in a little bit. The north wall of the barn leans in a little. Is it going to fall? See also: lean
(McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.)