challenged

Good, caring teachers recognized his talent and challenged him to work hard to compete at the highest levels.

So the sorts of policy changes Obama announced Thursday night would, if challenged in court, be upheld as legal.

It would make a sensation, he thought; there was more than one generally accepted theory he had challenged or contradicted in it.

It was quite expected that his progress would be challenged, hence the warlike preparations.

In the midst of a torrent of invectives from every quarter, the military were challenged to fire.

Voting must be performed carefully because a defaced, improperly marked ballot may be challenged and thrown out.

Getting close to the kopje, he saw a number of the enemy slinking off, and at once challenged them.