The grid had buckled.
1	The	the	DET	DEF	Definite=Def|PronType=Art	2	det	_	_
2	grid	grid	NOUN	SG-NOM	Number=Sing	4	nsubj	_	_
3	had	have	AUX	PAST-AUX	Mood=Ind|Tense=Past|VerbForm=Fin	4	aux	_	_
4	buckled	buckle	VERB	PERF	Mood=Ind|Tense=Past|VerbForm=Fin	0	root	_	SpaceAfter=No
5	.	.	PUNCT	Period	_	4	punct	_	_
