Definition of ぐっと
ぐっと
gutto
adverb
1.
suddenly, at once, in one go, with a jerk, with a gulp(onomatopia)
2.
considerably, very much, a lot(onomatopia)
3.
firmly, with an effort, tightly, exerting pressure(onomatopia)
4.
completely (e.g. at a loss)(onomatopia)
5.
deeply (e.g. moved)(onomatopia)