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a·gainst

against

 
pronunciation:
genst
part of speech: preposition
definition 1: in the opposite direction to.
They were walking against the wind.
antonyms:
with
definition 2: in opposition to.
What you did was against the rules.
antonyms:
behind, for, in favor of
definition 3: in contact with.
Waves crashed against the shore.
definition 4: on or touching, so as to be supported by.
I'll lean the ladder against this tree.