Native speaker
In Emirati Arabic, “Yesterday” is أمس (aamis).
أمس
Yesterday
It's in the phrasebook under Time, days & appointments, with 26 more like it.
as-sabit
al-yohm
al-jum'a
baakir
al-khamees
as-subuh
Source: DLIFLC Emirati Basic Language Survival Kit (2007). Credits and licences