[Otstat]
"to fall behind, to lag, to leave alone" is Отстать in Russian.
Отстать means "to fall behind, to lag, to leave alone" in English.
Listen to the pronunciationWord #3031 of 6,000 by frequency in Russian.
Он начал отставать от группы на третьем километре.
He started to lag behind the group at the third kilometer.