
abstimmen
to vote
To make a decision or express one's opinion through an election or by casting a vote.
Das Parlament wird morgen über das neue Gesetz abstimmen.
Parliament will vote on the new law tomorrow.
to vote / coordinate / tune
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to vote
To make a decision or express one's opinion through an election or by casting a vote.
Das Parlament wird morgen über das neue Gesetz abstimmen.
Parliament will vote on the new law tomorrow.

to coordinate with
To adapt, coordinate, or harmonize something with something else.
Die Farbe der Vorhänge ist perfekt auf die Möbel abgestimmt.
The color of the curtains is perfectly coordinated with the furniture.

to coordinate
To consult or coordinate with other people in order to ensure a shared course of action.
Die Abteilungen müssen sich besser abstimmen, um Doppelarbeit zu vermeiden.
The departments need to coordinate better to avoid duplicate work.

to tune
To adjust a musical instrument so that it produces the correct notes.
Vor dem Auftritt muss der Pianist das Klavier stimmen lassen, aber der Gitarrist kann seine Gitarre selbst abstimmen.
Before the performance, the pianist has to have the piano tuned, but the guitarist can tune his guitar himself.
'Abstimmen' is a separable verb with the prefix 'ab-'. In a main clause, 'ab' goes at the end; in a subordinate clause, it remains attached to the verb. The infinitive with 'zu' is 'abzustimmen'.
Die Mitglieder stimmen heute über den Vorschlag ab.
The members are voting on the proposal today.
The prepositions and the grammar help distinguish the meanings. 'Über' (+ accusative) signals a vote, 'auf' (+ accusative) means to adapt or coordinate something with something, and 'sich mit' (+ dative) means to coordinate with someone.
Wir stimmen über den neuen Plan ab.
We are voting on the new plan.
When it is about an election or a vote, the preposition 'über' is always used with the accusative. You vote 'über' a topic or a proposal.
Die Bürger konnten über den Bau des neuen Bahnhofs abstimmen.
The citizens were able to vote on the construction of the new train station.
To express that you adapt or coordinate something with something else, use the structure: 'etwas (Akkusativ) auf etwas (Akkusativ) abstimmen' (to coordinate something with something).
Der Koch stimmt die Gewürze genau auf die Hauptzutat ab.
The chef coordinates the spices precisely with the main ingredient.
When people coordinate with one another, the verb becomes reflexive and is used with the preposition 'mit' and the dative: 'sich mit jemandem abstimmen' (to coordinate with someone).
Bitte stimmen Sie sich mit Ihren Kollegen über den Termin ab.
Please coordinate with your colleagues about the appointment.
to be right / to vote / to tune
Stimmen and abstimmen both relate to making a decision by casting a vote. Stimmen focuses more on an individual vote or the side chosen with für or gegen, while abstimmen refers to the group voting process. Stimmen fits one’s own position, while abstimmen fits the process involving a group.

Wir stimmen heute über den Vorschlag der Vorsitzenden ab.
We are voting on the chairwoman’s proposal today.
Ich stimme für den Vorschlag der Vorsitzenden.
I am voting for the chairwoman’s proposal.