Hold Fast' is an idiom that means to remain firm and steadfast in one's beliefs or actions. The crossword solutions for this term include CLASP (5 letters), PERSEVERE (9 letters), CLING (5 letters), ENCHAIN (7 letters), GRIP (4 letters), ADHERE (6 letters), PIN (3 letters), ANCHOR (6 letters), COHERE (6 letters), CLENCH (6 letters), RETAIN (6 letters), SECURE (6 letters), Abideby (7 letters), ENGAGED (7 letters), and Standpaton (10 letters). All of these words are synonyms for the phrase 'Hold Fast' and describe the act of staying firm and determined in one's convictions.