Maximal effort is a phrase used to describe the highest level of effort that can be put into a task. It is often used in the context of sports, but can also be applied to any activity or job. The crossword solutions for the term maximal effort are ALL (3 letters) and TOTALCOMMITMENT (15 letters). ALL implies that every effort should be made to achieve the desired outcome, while TOTALCOMMITMENT suggests that one should be completely dedicated to the task at hand.