What do the following words and phrases have in common?

CROSSWALK
OVERDRAW
TOE HOLD
DOWN BELOW

HINTS:
1. Consider each clue's two component parts.
2. Each part can be followed by the same two words.

Answer:

Each part of each clue can be followed by THE LINE:

1. CROSS THE LINE / WALK THE LINE
2. OVER THE LINE / DRAW THE LINE
3. TOE THE LINE / HOLD THE LINE
4. DOWN THE LINE / BELOW THE LINE

Credit:
Damon J. Gulczynski