
der Einwurf
interjection
A brief remark or comment that is brought into a conversation or discussion.
Sein kritischer Einwurf brachte die Diskussion auf einen wichtigen Punkt.
His critical interjection brought the discussion to an important point.
interjection / throw-in / slot
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interjection
A brief remark or comment that is brought into a conversation or discussion.
Sein kritischer Einwurf brachte die Diskussion auf einen wichtigen Punkt.
His critical interjection brought the discussion to an important point.

throw-in
In sports, especially soccer, putting the ball back into play from the sideline by throwing it.
Nachdem der Ball die Linie überquert hatte, gab es Einwurf für die Heimmannschaft.
After the ball crossed the line, there was a throw-in for the home team.

slot
An opening or slot into which you can insert something, for example letters into a mailbox or coins into a machine.
Bitte werfen Sie die Post in den dafür vorgesehenen Einwurf am Tor.
Please put the mail into the designated slot at the gate.
'Der Einwurf' comes from the verb 'einwerfen' (to throw in). This literal meaning connects all the senses: you 'throw' a comment into a discussion, a ball onto the field, or a letter into the box.
Darf ich kurz etwas einwerfen?
May I briefly add something?
When an 'Einwurf' is a remark, it is often combined with the verb 'machen' (to make). Typical adjectives are 'kurz' (brief), 'wichtig' (important), or 'kritisch' (critical).
Danke für diesen wichtigen Einwurf.
Thank you for this important interjection.
In a sports context, the phrase 'Einwurf für...' (throw-in for...) is often used to indicate which team may throw the ball in. The situation itself is described with 'es gibt Einwurf' (there is a throw-in).
Nach dem Foul gab es Einwurf für die gegnerische Mannschaft.
After the foul, there was a throw-in for the opposing team.
As an opening or slot, 'Einwurf' is often the second part of a compound noun. Examples are 'der Briefeinwurf' (mail slot) for letters or 'der Münzeinwurf' (coin slot) for coins.
Der Briefeinwurf an unserer Haustür ist zu klein für große Umschläge.
The mail slot on our front door is too small for large envelopes.
remark
A remark is generally a short spoken or written statement. An Einwurf is more specific: it is inserted into an ongoing conversation or discussion. Einwurf is therefore more precise for an inserted comment.

Während der Diskussion unterbrach Leas kurzer Einwurf den Redner.
During the discussion, Lea's brief interjection interrupted the speaker.
Nach dem Vortrag machte Lea noch eine kurze Bemerkung zum letzten Thema.
After the lecture, Lea made a brief remark about the final topic.