8353. 'And he cried to Jehovah' means pleas made to the Lord as a result of the grief. This is clear from the meaning of 'crying' as calling for help, dealt with in 6801, and also deep grief, 7782, so that pleas made as a result of grief are meant as well - 'Jehovah' in the Word being the Lord, see 8261.

7782. 'And there will be a great cry in the whole land of Egypt' means deep grief. This is clear from the meaning of 'a cry' - which goes up because the firstborn are dead, in the internal sense because of damnation - as grief. The reason why 'a great cry' means deep grief is that the greater the grief, the deeper it is.