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A Toch K'dei Dibbur is the amount of time (~3s) that one has to fix a bracha, renege on a deal, etc. The phrase used for this time frame is a machlokes between the Mishnah Berurah (206:12) and the Taz (206:3) whether "U'Mori" is included.
What exactly is the nekudas hamachlokes between these opinions? Why does the Chafetz Chaim leave it out while the Taz includes it?
Related: Shalom Alecha Rebbi (u'Mori) and How far can I back up in a bracha?
Look at Bava Kama 73a. the Gemara says "shalom Alecha Rebbi u'Mori", but the Rashash takes it out based on a Rosh. Also, the manuscripts do not have the word "u'Mori".
