Lose (one's) grip on (someone or something) American British phrasal verb
1. To lose a firm grasp on someone or something with hand
Marry lost her grip on the horse and then fell into a pond nearby.
Hang in there! Just a more 2 inches you will reach the mountain top. Don't lose your grip on the rope.
2. To lose a clear understanding of something
He loses his grip on technical problem, so he makes everything messy.
I feel like losing my grip on this situation, I can not settle this tense argue.
The verb "lose" should be conjugated according to its tense.
To make love or have sex with someone
They just jumped each other’s bones after one date.