What does "campaigning" mean?

gerund of campaign: the act of taking part in a campaign.

Campaigning

Common synonyms include: electioneering, activism, advertise, advertising, advocacy, advocacy oriented.

noun, verb

noun, verb ·3 syllables ·Moderate ·College level

Noun

1
gerund of campaign: the act of taking part in a campaign. form-of, gerund
"He has had crosses and losses; terrible campaignings against the Turk, in old times; and always such a stock of quarrels, at home, as must have been still worse to bear."
2
the campaign of a candidate to be elected wordnet

Verb

1
present participle and gerund of campaign form-of, gerund, participle, present

"He refused to do much campaigning."

From campaign + -ing.