
der Vorschlag
proposal / suggestion
An idea or plan that is presented to another person or a group for consideration and decision.
Ich habe einen Vorschlag: Gehen wir heute Abend ins Kino?
I have a suggestion: Shall we go to the movies tonight?
proposal
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proposal / suggestion
An idea or plan that is presented to another person or a group for consideration and decision.
Ich habe einen Vorschlag: Gehen wir heute Abend ins Kino?
I have a suggestion: Shall we go to the movies tonight?

grace note
In music, an ornament in which one or more short notes are played before the main note.
Der Pianist spielte die Melodie mit einem eleganten Vorschlag.
The pianist played the melody with an elegant grace note.
'Der Vorschlag' (proposal/suggestion) is the noun related to the separable verb 'vorschlagen' (to suggest). The structure is 'vor' (forward, beforehand) and 'schlagen' (in the sense of 'to bring something in a direction'). So you put an idea forward.
Was schlägst du für heute Abend vor?
What do you suggest for tonight?
Very common and useful combinations are 'einen Vorschlag machen' (to make a suggestion), 'einen Vorschlag annehmen' (to accept a proposal), or 'einen Vorschlag ablehnen' (to reject a proposal). You can also 'eingehen' auf einen Vorschlag (respond to / go along with a suggestion).
Darf ich Ihnen einen Vorschlag machen?
May I make you a suggestion?
To explain the content of a proposal, you can use an infinitive construction with 'zu' or a subordinate clause with 'dass' (that). The infinitive construction is often more elegant.
Sein Vorschlag, das Projekt abzubrechen, wurde diskutiert.
His proposal to cancel the project was discussed.
This meaning is purely technical language from music. You recognize it immediately from the context: when notes, melodies, instruments, or composers are being discussed, the musical 'Vorschlag' (grace note) is meant.
In diesem Stück von Mozart gibt es viele Vorschläge.
There are many grace notes in this piece by Mozart.
idea
An Idee may initially be just one's own thought about a possible solution. A Vorschlag is an idea or plan that is presented to others for consideration or decision. Once the thought is deliberately brought into a shared decision-making process, Vorschlag is the better fit.

In der Besprechung machte Lea den Vorschlag, den Termin zu verschieben.
At the meeting, Lea proposed postponing the appointment.
Vor der Besprechung hatte Lea die Idee, den Termin zu verschieben.
Before the meeting, Lea had the idea of postponing the appointment.