hole
This hole is very small.
opening
This trick is very useful.
orifice (of the human body)
A human has seven orifices.
hole
This hole is very small.
opening
This trick is very useful.
orifice (of the human body)
A human has seven orifices.
(fig.) key (to the solution of a problem)
He found the knack for solving the problem.
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(fig.) key (to the solution of a problem)
He found the knack for solving the problem.