To regain one's self-control; to discipline and focus oneself instead of giving in to one's feelings or laziness.
example
Reiß dich zusammen und mach deine Hausaufgaben, sonst wird das nichts!
Pull yourself together and do your homework, otherwise this won't work!
Usage tips
Separable verb
'Zusammenreißen' (to pull oneself together/to gather up) is a separable verb. The prefix 'zusammen-' goes at the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
EXAMPLE
Er reißt sich auch in schwierigen Situationen zusammen.
He pulls himself together even in difficult situations.
Word structure
The verb consists of 'zusammen' (together) and 'reißen' (to tear, to pull). The literal meaning 'to pull together forcefully' helps you understand both meanings: you 'pull' your feelings together (control yourself), or you 'pull' things together hastily (gather them up).
EXAMPLE
Vor der Prüfung musste ich mich noch einmal richtig zusammenreißen.
Before the exam, I really had to pull myself together once more.
Reflexive verb
In the meaning 'sich beherrschen' (to control oneself), the verb is always reflexive: 'sich zusammenreißen' (to pull oneself together). It is very often used in the imperative to tell someone to discipline themselves.
EXAMPLE
Reiß dich zusammen, die Präsentation fängt gleich an!
Pull yourself together, the presentation is about to start!
Context clue
The two meanings are easy to distinguish: the reflexive form 'sich zusammenreißen' always means to control oneself. If there is an accusative object such as 'Papiere' (papers) or 'Sachen' (things), it means hasty gathering.
EXAMPLE
Sie musste sich zusammenreißen, um nicht zu lachen.
She had to pull herself together so as not to laugh.