tail into (something)
To flow into, converge with, or connect to something by or at the end. The financial presentation tailed into a discussion about possible ways of boosting revenue. The iconic river winds its way through the center of the city, eventually tailing into the harbor that was once the country's primary point of commerce. The coffee starts with an intense caramel flavor that tails into that of dark chocolate.
tail into
v. To flow into something. Used of a tributary: Two rivers tail into the bay.