fell behind

• laggedFell behind others
• slippedLost traction momentarily
• trailingFollowing behind something
• dropped backMoved rearward in position
• lost groundYielded previously held advantage

slowed · stumbled · straggled · delayed · catching up · deadline · overdue · race · marathon · pace · struggling · exhausted · limping · fading · distance · gap · behind schedule · procrastinated