1. (verb) retreat

• drop off
• fall back
• lose
• recede

2. (verb) hang (back) or fall (behind) in movement, progress, development, etc.

• dawdle
• fall back
• lag

1. (verb) hang (back) or fall (behind) in movement, progress, development, etc.

• drag
• drop back
• drop behind
• get behind
• hang back
• trail

1. (verb) retreat

• regress
• retrograde
• retrogress

2. (verb) hang (back) or fall (behind) in movement, progress, development, etc.

• follow

1. (verb) retreat

• advance
• gain
• gain ground
• get ahead
• make headway
• pull ahead
• win

1. (verb) retreat

• ceding back
• recession
• receding
• recession

2. (verb) hang (back) or fall (behind) in movement, progress, development, etc.

• dawdler
• dawdler
• dawdler
• drone
• drone
• drone
• laggard
• laggard
• laggard
• lagger
• lagger
• lagger
• poke
• poke
• poke
• trailer
• trailer
• trailer
• lag
• retardation
• slowdown