mass, total, worldwide | consumer, economic, trade
a consumer boycott of GM foods

declare, impose, introduce
Opposition groups declared a boycott of the elections.

call for, threaten
Lawyers threatened a boycott of the courts.

end, lift
Politicians want to end their boycott of the talks.

join
There is pressure on the biggest union to join the boycott.

campaign

~ by
a boycott by international singers

~ of
The group is calling for a mass consumer boycott of these products.

~ on
The US has imposed a boycott on some European goods.

officially

threaten to | call on sb to, urge sb to
They have urged people to boycott foreign products.