Someone who rules or controls something with a mailed fist is in absolute control and tolerates no dissent. A mailed fist in a velvet glove is used to describe someone who appears soft on the outside, but underneath is very hard.
'Iron fist' is an alternative form.
If something makes your flesh crawl, it really scares or revolts you.
('Make your flesh creep' is an alternative. 'Make your skin crawl' is also used.)
From 'Robinson Crusoe', a 'Man Friday' refers to an assistant or companion, usually a capable one. The common feminine equivalent is 'Girl Friday'. (Also, 'right-hand man'. )
A man of letters is someone who is an expert in the arts and literature, and often a writer too.
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