The term 'sitting duck' is a phrase used to describe someone who is vulnerable and easy to take advantage of. The crossword solutions for this term include 'BUTT' (4 letters), 'SAP' (3 letters), 'DECOY' (5 letters), 'PATSY' (5 letters), 'VICTIM' (6 letters), 'fallguy' (7 letters), 'deadduck' (8 letters), 'deadmeat' (8 letters), 'easymark' (8 letters), and 'easytarget' (10 letters). All of these words are related to the idea of someone being an easy target, and can be used to describe someone who is in a vulnerable position.