共謀して行動するの英語

to act in unison―act with one accord

collusion

to invite each other to do something jointly

in cahoots with

a conspirator

to lay a plot―hatch a plot―concoct a plot

to become companions and to act in cooperation with each other

conspire together

lay a conspiracy

a scheming person

act in collusion with…

in association with

to invite someone to do something jointly

to play into each other's hands

of a group, with united hearts, the action of performing a joint activity

organized body of people (group assembled to do activity together; clique, band, crew, caravan, etc.)

machinate a plot

a group of people who plan an evil deed together

in conspiracy

a member of a conspiracy

a group of people who are together for a particular purpose

a group consisting of people with the same interests

to act in concert with one―act in live with one―（倣うの意味なら）―follow suit

the action of doing something together with someone else out of obligation or sense of duty

to act in unison

of two or more persons, to act together

lay a conspiracy

plot against the government

acting with less concern for yourself than for the success of the joint activity

join with another in an action