mettere la freccia -> indicate

[melenia]

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(Of a driver or motor vehicle) signal an intention to change lanes or turn using an indicator: ‘Cal indicated and moved across the road’‘one car had indicated left but pulled out in front of him’.

[spiros]

Δεν χρειάζεται το «to» και χρειάζεται διάστημα πριν και μετά το διαχωριστικό:

mettere la freccia -> indicate