The phrase "respond collectively" is correct and usable in written English.
It is typically used to indicate a group of people responding together or in unison to a situation, idea, or action. For example: "The community has responded collectively to the natural disaster with a generous donation of supplies and volunteer labor."
"It is urgent to respond collectively to these migratory flows.
In both examples, she celebrates the capacity of ordinary people to respond collectively to challenges they commonly face.
In a scathing statement, Human Rights Watch condemned the EU's "utter failure to respond collectively and compassionately to refugee flows".
While the prime minister is asking to be believed, Mr. Yerushalmi wrote: "If the public could respond collectively, it would, of course, ask: 'Why?
There is increasing evidence that the ongoing effects of trauma are strongly dependent on the ways in which communities respond collectively.
To address these challenges, communities will need to mobilise their people and resources to respond collectively to challenges that affect the community at large.
Respondents responded collectively to the questionnaires from within their classrooms.
When she started to tear up, the girls, responded, collectively, "Awww".
When the Republican presidential nominee John McCain tapped Sarah Palin as his running mate in late August 2008, the political media world responded collectively: Huh? Who's that?
With increased acknowledgment of global climate change and warming, governments, consumers, and firms are responding collectively to create today's low-carbon economy.
In addition, they are responding collectively to environmental risks and opportunities associated with wildfire, noxious weeds and invasive grass species, prospective uranium mining, and restoration of cultural-landscape features.
