| in fremden Sprachen reden | speak in tongues |
| in Sprachen reden | speak in tongues |
| in fremden Zungen sprechen | speak in tongues |
| ins Fettnäpfchen treten | drop a brick drop a clanger put one's foot in one's mouth |
| in Scheiben schneiden | slice |
| in seine Schranken weisen | put someone in their place |
| in den Rücken fallen | stab somebody in the back |
| in den Schatten stellen | dwarf eclipse outshine |
| in die Brüche gehen | go to pieces |
| an den Kräften zehren | debilitate |
| im Regen stehen lassen | hang out to dry |
| in Anspruch nehmen | occupy |
| in Würfel schneiden | dice |
| in den Krieg ziehen | go to war |
| in den roten Zahlen | in the red |
| in eine Falle gehen | fall into a trap |
| in eine Richtung gehen | head |
| in freiem Ermessen | arbitrary |
| in kleinen Schritten | piecemeal |
| in Flammen aufgehen | go up in flames |