The Collaborative International Dictionary
To lob a ball
Lob \Lob\, v. t. [imp. & p. p. Lobbed (l[o^]bd); p. pr. & vb. n. Lobbing.] 2. To let fall heavily or lazily.
And their poor jades
Lob down their heads.
--Shak.
2. to propel (relatively slowly) in a high arcing trajectory; as, to lob a grenade at the enemy.
To lob a ball (Lawn Tennis), to strike a ball so as to send it up into the air.