Step 1: Understand abatement.
Under Order XXII of the CPC, 1908, if a party dies during a suit, the legal representatives must be brought on record in time. If not, the suit abates, meaning it stops.
Step 2: Find the relevant rule.
Order XXII Rule 9 lets the court set aside the abatement and revive the suit.
Step 3: Know the condition.
Revival is not automatic. The applicant must show sufficient cause for not acting within the time allowed.
Step 4: See what sufficient cause means.
It can be illness, no knowledge of the death, or other genuine reasons beyond the party's control. The delay must not be careless.
Step 5: Rule out wrong options.
Whether a decree has been passed is not the test. The defendant's knowledge of death is not the test. Error on the face of record belongs to review, not abatement.
Step 6: Final answer.
The court may set aside abatement only if sufficient cause is shown.
\[ \boxed{\text{Sufficient cause for not making the application within time.}} \]