I wonder about this, as it seems to me that, if we avoid all colourful idiomatic phrases, our language becomes incredibly bland. Sometimes I think we should instead be looking to enrich the language, by adopting new idioms from around the world, rather than avoiding idiomatic usage. On the other hand, Jenkins is absolutely right, that we must always be sensitive about how we express ourselves, and if we see that listeners are failing to understand something, we should endeavour to rephrase our ideas in more straightforward terms.
I was thinking about idiomatic usage as I was watching an English Premier League game last night, Arsenal v. Tottenham. And I noted down the following idiosyncratic football idioms from the commentators:
- Arshavin was on his bike
- Arshavin wasn't going to allow him to get up a head of steam
- Arsenal can put it to bed before half time.
- in comparison with the Manchester derby a couple of weeks ago, chalk and cheese
- credit again to Gallas for slamming the door shut
- that would be a real feather in the cap for Harry Redknapp
One way or another, I feel sorry for foreign language learners who struggle to grasp what is going on. A very common phrase in football commentary is under the cosh, to indicate that a team is under a lot of pressure; and I can imagine a learner of English looking up cosh, finding it is some kind of weapon, and then puzzling over this phrase. In reality, most native speakers who know the phrase under the cosh have no clue what a cosh is.
So, should we avoid using such phrases in international settings? My feeling is that it's fine to use them just so long as you are always sensitive about the potential for being misunderstood and are then prepared to rephrase yourself using other terms. In linguistics, we say this is part of accommodation, and it is an essential skill for successful international communication.
Reference
Jenkins, J. (2009). Exploring attitudes towards English as a Lingua Franca in the East Asian context. In K. Murata & J. Jenkins (Eds.) Global Englishes in Asian contexts: Current and future debates (pp. 40-56). Basingstoke, UK: Continuum.