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забегать вперёд stresses
gen.	forestall; nip on ahead; take the ball before the bound; catch the ball before the bound; get so far ahead (Alina_Demidova); preempt (at risk of preempting myself, let me tell you... – забегая вперед, скажу вам... Рина Грант); fast-forward (Ремедиос_П); overleap; get ahead of things (Ремедиос_П); anticipate events; act in advance
Gruzovik	run ahead
Игорь Миг	get a head start
amer.	get ahead of oneself (Maggie)
idiom.	jump the gun (Anglophile); jump ahead of oneself (I'm sorry, I'm jumping ahead of myself, that happened five years later. ART Vancouver); run before you can walk (Clepa); get ahead of (oneself Баян); be running ahead of the story (в рассказе, повествовании Dmitry_Arch)
Makarov.	ride before the hounds; ride past the hounds; run before the hounds; jump ahead of oneself; put the cart before the horse (преждевременно делать что-либо); run a few steps forward; run ahead (при изложении материала)
proverb	be ahead of time; anticipate
забегая вперёд
gen.	advanced topic (применительно к техн. документации Yuriy.V); at the risk of jumping rather ahead (markushe); looking further forward (Bullfinch)
Makarov.	leaping ahead
math.	looking ahead (, we can call this solution ...)
scient.	anachronically (A.Rezvov); anachronistically (строго по контексту, при описании научных представлений прошлого с использованием терминологии, которая появилась лишь в последующем: Framing the problem – anachronistically – in terms of Ragnar Frisch's famous distinction... A.Rezvov)

забегать вперёд: 9 phrases in 4 subjects

Diplomacy	1
General	4
Makarov	3
Slang	1