Idiom: Teach your grandmother to suck eggs

Idiom Definitions for 'Teach your grandmother to suck eggs'

When people say 'don't teach your grandmother to suck eggs', they mean that people shouldn't try to teach someone who has experience or is an expert in that area.
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#0 /home/aking/app/lib/class.db_mysqli.php(406): UE_DB_Base->haltmsg('Error: %s\n')
#1 /home/aking/app/lib/class.db_mysqli.php(130): DB_MySQLi->halt('Error: %s\n', NULL)
#2 /home/aking/app/lib/class.db_base.php(21): DB_MySQLi->query('SELECT w.word\n\t...')
#3 /home/aking/app/lib/class.idiom.php(283): UE_DB_Base->query('SELECT w.word\n\t...')
#4 /home/aking/public_html/reference/idioms/idiom.php(157): UE_Idiom->get_similar_idioms()
#5 {main}