To understand the phrase that means "To procrastinate or delay something," we should examine each option:
- Call it a day: This phrase means to stop working for the day or to conclude something, not related to delaying.
- Put off: This phrase means to delay or postpone something, which matches the meaning of procrastinating.
- Break the ice: This means to ease tension or get people comfortable in a new situation, not related to delaying.
- Blow off steam: This means to release pent-up energy or emotions, typically stress, not related to delaying.
Therefore, the correct answer is "Put off" as it directly aligns with the meaning of "To procrastinate or delay something."