Avoiding the big-rip jeopardy in a quintom dark energy model with higher derivatives

In the framework of a single scalar field quintom model with higher derivative, we construct in this Letter a dark energy model of which the equation of state (EOS) w crosses over the cosmological constant boundary. Interestingly during the evolution of the universe w<−1 happens just for a period of time with a distinguished feature that w starts with a value above −1, transits into w<−1, then comes back to w>−1. This avoids the big-rip jeopardy induced by w<−1.