The phrase "a significant gesture" is correct and usable in written English.
You can use it to refer to an action that holds meaning or expresses an intention. For example: "John offered me a hug as a significant gesture of apology for his mistake."
The pope asked for "a significant gesture of clemency".
Make a significant gesture with your hands and hold it.
It was a significant gesture and fascinating for being unfamiliar music.
It appeared republicans were ready to make a significant gesture on the central issue of decommissioning.
He received that from Mr. Chirac, a significant gesture considering that the French president was among those urging Mr. Bush last year to deal with Mr. Arafat.
It was a significant gesture by the club, because the last two seasons have seen him start only nine matches for the Tigers.
If true, that's a very significant gesture likely to the tune of well over a billion dollars (though dampened a bit by a roll back of certain other bonuses).
While there are legitimate objections to the use of referendums when it comes to human rights issues, last month's yes was a hugely significant gesture of love and acceptance towards Ireland's LGBTQ community.
BANGKOK — Myanmar began freeing some political prisoners as part of a broader amnesty on Wednesday, but the initial numbers disappointed many people who had hoped for a more significant gesture of liberalization.
Contesting Moscow's self-serving versions of history and undermining anniversary ceremonies that promote Russian militarism are a less significant gesture, but Kiev will make do with whatever it can get.
As Attitude magazine pointed out, a Stonewall school report released this week found that almost half of LGBT young people are still bullied at school, obviously meaning that high-profile figures making their sexuality known is still a very significant gesture.
