Andante means play at a moderate speed, or slightly slowly. It is faster than 'adagio', but slower than 'allegro' and 'allegretto'. The metronome could be set between 120 and 150 crotchets per minute. 'Piu andante' would mean 'slower'.
Literal meaning of the Italian is 'Going' or 'walking', i.e. at a walking pace.
Pieces of music marked 'andante' may thereby acquire that name, e.g. 'Andante in
Eb'.
The extract below is marked 'andante'. It is from Handel's Harmonious Blacksmith.