obstacle noun

/ˈɒb.stɪ.kl ̩/

/ˈɑːb-/ n [C]

Definition

something that blocks you so that movement, going forward or action are prevented or made more difficult

The biggest obstacle in our way was a tree trunk in the road.

This decision has removed the last obstacle to the hostages' release.

(Definition of obstacle noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

to worry

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