NY Times Crossword
August 31, 2015
Michael Dewey

The answers to the following clues will have something in common.

1. Attack an endeavor vigorously
2. Make a major decision, like getting married
3. Lose your mind
4. Little by little

Answers:

1. Dive in
2. Take the plunge
3. Go off the deep end
4. Step by step

What they have in common:

Ways of entering a pool