I’m back to choir rehearsals, courtesy of my new, daytime job. My local choir was practicing ‘Steppin’ out with my baby‘ (video) by Irving Berlin (not the choir’s usual repertoire). For a moment, I thought the words were ‘There’ll be smooth sailin’ ’cause I’m trimmin’ my nails’ (well, the bit just before that is ‘I’m all dressed up tonight’ and the bit just after is ‘In my top hat and my white tie and my tails’. What else does one do before a night out?). Then I looked again and saw that it’s actually ‘I’m trimmin’ my sails’.
The relevant definition is:
3. to adjust (the sails or yards) with reference to the direction of the wind and the course of the ship.