1. (adverb)by, past so as to pass a givenpoint "every hour a train goes past"
2. (adverb)aside, by, away in reserve; not for immediate use "started setting aside money to buy a car"; "put something by for her old age"; "has a nest egg tucked away for a rainy day"
4. by indicates how sth is done sent by email; traveling by plane/bus/car/train/boat; You won't achieve anything by lying.; a path lit by moonlight
5. by before or not later than We'll be done by 6:00.; asleep by the time I got home; They should be back by now.
6. by as a result of sth death by drowning; I dialed your number by mistake.
7. by by accident/mistake indicates a measured amount, rate, etc. The ball missed my head by half an inch.; I get paid by the hour.; The room is 16' by 16'.
8. by according to By law, teenagers cannot drive at night.; I knew by the look on mom's face.
9. by indicates which part sb touches She grabbed the boy by the hand.; to pick up the suitcase by the strap
10. by by the way indicates sth that may not be related to the conversation By the way, have you seen Emily lately?
11. by little by little/day by day etc. indicates that sth happens gradually Week by week she felt better.
12. (adverb)by past people walking by; A few minutes went by.
13. by come/stop/go by to visit for a shorttime I went by my parents on the way home.
Definition of 'By'
Webster Dictionary
1. (adj)By out of the common path; aside; -- used in composition, giving the meaning of something aside, secondary, or incidental, or collateral matter, a thingprivate or avoiding notice; as, by-line, by-place, by-play, by-street. It was formerly more freely used in composition than it is now; as, by-business, by-concernment, by-design, by-interest, etc
2. (adverb)By near; in the neighborhood; present; as, there was no person by at the time
7. By near to, while passing; hence, from one to the other side of; past; as, to go by a church
8. By used in specifying adjacent dimensions; as, a cabintwenty feet by forty
9. By against
10. By with, as means, way, process, etc.; through means of; with aid of; through; through the act or agency of; as, a city is destroyed by fire; profit is made by commerce; to take by force