The term 'By Leaps and ___' is completed by the crossword solutions 'Manyfold' (8 letters) and 'HOP' (3 letters). 'Manyfold' means to increase or multiply in a large amount, while 'HOP' is an informal term for jumping. The phrase 'By Leaps and ___' is often used to describe a situation where something is increasing or progressing rapidly. Therefore, the complete phrase 'By Leaps and Manyfold' implies that something is growing or advancing quickly and in large amounts. Similarly, 'By Leaps and HOP' suggests that something is progressing rapidly with jumps or leaps.