We don't have synonyms for gain ground yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are gains ground, gained ground and gave ground.
°To require a disobedient child to remain at home or refrain from other privileges such as uses of the Internet, phone, TV, or music, usually as a punishment.
"The teenager's father decided to ground him for two weeks after he broke curfew again."
°To require a disobedient child to remain at home or refrain from other privileges such as uses of the Internet, phone, TV, or music, usually as a punishment.
"The teenager's father decided to ground him for two weeks after he broke curfew again."