ナイフは下に置いて下さい。危ないから。

knife

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

below; down; under; younger (e.g. daughter); bottom; beneath; underneath; just after; right after; inferiority; one's inferior (i.e. one's junior); trade-in; preliminary; preparatory

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to put; to place; to leave (behind); to establish (an organization, a facility, a position, etc.); to set up; to appoint (someone to a certain position); to hire; to employ; to place (one's trust, one's faith, etc); to bear (in mind etc); to put down a tool (e.g. a pen) hence stopping what one is doing with that tool; to take in (boarders, etc.); to provide lodging in one's house; to separate spatially or temporally; to do something in advance; to leave something in a certain state; to keep something in a certain state

to give; to confer; to bestow; to kindly do for one; to oblige; to favour; to favor

dangerous; risky; hazardous; perilous; precarious; in danger; in jeopardy; critical; grave; at risk; uncertain; unreliable; insecure; unsteady; doubtful; close (i.e. a close call); narrow; look out!; watch out!

from (e.g. time, place, numerical quantity); since; from (originator); by; because; since; out of (constituent, part); through (e.g. window, vestibule); after; since