prep. 反对, 对着, 倚靠

prep. Abreast; opposite to; facing; towards; as, against the

mouth of a river; -- in this sense often preceded by over.

prep. From an opposite direction so as to strike or come in

contact with; in contact with; upon; as, hail beats against the roof.

prep. In opposition to, whether the opposition is of

sentiment or of action; on the other side; counter to; in contrariety

to; hence, adverse to; as, against reason; against law; to run a race

against time.

prep. By of before the time that; in preparation for; so as

to be ready for the time when.