Clauson (1972)
An etimological dictionary of pre-thirteenth-century Turkish
p. 255
1 eş-
‘to amble’; survives only, with slightly altered meaning ‘to run, hurry’, in SW Osm. Türkü viii ff. (I am the Road (or Spring?) God with the dappled horse) yarı:n keçe: eşü:rmen ‘early and late I amble along’ IrkB 2: Xak. xi atlığ eşdi: xabba’l-fāris wa rakada ‘the horseman ambled (Hend.)’ Kaş. I 166 (eşe:r, eşme:k): xiv Muh.(?) qawqaza (corrupt; iqaza‘a) wa harwala ‘to move fast, to amble’ eş- Rif. 114 (only): Kıp. xiii (‘food’ aş) and the same word (in fact eş) is used when you order someone to hurry (yasāq) his horse or baggage animal Hou. 15, 14; sir bi’l-dābba ‘travel on horseback’ eşğil do. 40, 19: Osm. xiv ff. eş- ‘to amble’; less precisely ‘to hurry (on horseback)’; c.i.a.p. TTS I 283; II 405; III 269; IV 313.