Gain time
Definition 1 of 2
Pro Tip 1/3Strategic Delay
Using 'gain time' suggests a purposeful and strategic delay, often in a high-stakes situation. 
The candidate seemed to gain time during the debate by changing topics.
Pro Tip 2/3Time Advantage
'Gain time' implies trying to secure a temporal advantage, often against a counterpart or challenging situation. 
He hoped to gain time to better formulate his counterproposal.
Pro Tip 3/3Tactical Maneuver
The phrase is often used in contexts where tactics and strategy are important, like in legal or political arenas. 
Politicians may gain time to win public support.