Collins Concise English Dictionary © HarperCollins Publishers::

smarm /smɑːm/ Brit informal vb
  1. (transitive) often followed by down: to flatten (the hair, etc) with cream or grease
  2. when intr, followed by up to: to ingratiate oneself (with)
Etymology: 19th Century: of unknown origin

'smarm' also found in these entries:
In the English description:

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