step in
Not threatened.
(intransitive) To act as a replacement or substitute. / (intransitive) To get involved; to act
(engineering) A simple bearing in which part of the outer surface of a cylindrical shaft, the “journal”, slides on the inner surface of a cylindrical hole, with no rolling elements.
(organic chemistry) The monoterpene hydrocarbon p-mentha-1,8-diene used as a cytological clearing agent
p-mentha-1,8-diene
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