A player using a trigger strategy initially cooperates but punishes the opponent if a certain level of defection (i.e., the trigger) is observed.

Whatever had prompted the doctor to cooperate initially had evaporated as his contrariness reasserted itself.

After stopping in a restaurant parking lot and initially cooperating with the officers, Twinning and Davis opened fire and killed both officers.

The Menominee did not initially cooperate with the new policy.

Abdulmutallab initially cooperated with investigators, then stopped talking.

Mr. Citron, who initially cooperated for this article, declined to answer further questions last week.

And she has listened to eight hours of taped police interviews with Mr. Gehring, who initially cooperated with investigators.

On 22 June 1950, Kahar arrived in Ujungpandang, and initially cooperated with the Indonesian government and army.

Although the brothers' relationship remained tense throughout Coloman's reign (which finally led to the blinding of Álmos and his infant son), they initially cooperated.

McCroskey did not initially cooperate with police after his arrest.